If Canon uses the 1Dx body, $9000+ is a real possibility. Look at what they did with the 1Dc. Of course, then potential buyers will be able to buy a D800 body plus Nikon 24-70 and 70-200 lenses instead and still have money left over.

My guess is that Canon isn't that stupid and will use a 5D3 body with two Digic 5+ processors, for a cost of $4500-5000. However, I think 3FPS would be quite adequate. I've never understood the obsession with high pixel count and high frame rate. When I do landscape photography, my frame rate is measured in tens of seconds or even minutes. And most studio strobes can't recycle faster than 2 or 3 FPS (although the real limit is how fast electricity can be sucked out of the wall).

With Canon's recent pricing policy ($2300 for a 3 1/2 star lens) I am guessing it will be at least 50% higher than the competition. The D800 is about $3000 and the 5D3 is $3500 so this will be between $4500 and $5K.